A NATO command spokesman, U.S. Air Force Lt. Col. Lester T. Carroll, said the shooter was taken into Afghan custody shortly after the incident. The slain adviser was a contractor but the name and nationality of the deceased were being withheld, Carroll said.

Deputy Police Chief Mohammad Daoud Amin said it has not been determined whether the American adviser's death was intentional or accidental. He said an investigation was under way and declined to give more details of the incident, which occurred in central Kabul on the compound housing the governor of the city and near a number of key ministries.

"We can confirm that a civilian police adviser was shot and killed this morning by a suspected member of the Afghan uniform. The suspected shooter is in Afghan custody," Carroll said. He said Afghan and NATO officials were still trying to confirm initial reports that the shooter was a policewoman.

The killing came just hours after an Afghan policeman shot five of his colleagues at a checkpoint in northern Afghanistan late Monday. The attacker then stole his colleague's weapons and fled to join the Taliban, said deputy provincial governor in Jawzjan province, Faqir Mohammad Jawzjani.

While Barack and Michelle Obama put out a Christmas video wishing the country "Happy Holidays" and "Merry Christmas," Obama said that America should be thankful to be receiving soldiers back from Iraq. Obama also said, "The transition in Afghanistan is underway. After a decade of war, our heroes are coming home. And all across America, military families are reuniting."

"So this week let’s give thanks for our veterans and their families," he continued. "And let’s say a prayer for all our troops--especially those in Afghanistan – who are spending this holiday overseas, risking their lives to defend the freedoms we hold dear."

Yes, we should be praying for these Americans who are being killed by the people they are training! We should also be thankful that many are returning home. It is an outrage that the killing of Americans by Afghan police that they have trained continues, and not only continues, but has been escalating as Ben Swann points out.

The surge of attacks, known as Green on Blue attacks or insider attacks, is throwing doubt on the capability of the Afghan security forces, being trained by our military, to take over once international troops pull out of Afghanistan.